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EUVD-2026-22196

fkie_cve-2021-21366

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. xmldom versions 0.4.0 and older do not correctly preserve system identifiers, FPIs or namespaces when repeatedly parsing and serializing maliciously crafted documents. This may lead to unexpected syntactic changes during XML processing in some downstream applications. This is fixed in version 0.5.0. As a workaround downstream applications can validate the input and reject the maliciously crafted documents.

GHSA-h6q6-9hqw-rwfv — Misinterpretation of malicious XML input

Affected: npm: xmldom

### Impact

xmldom versions 0.4.0 and older do not correctly preserve [system identifiers](https://www.w3.org/TR/2008/REC-xml-20081126/#d0e4313), [FPIs](https://en.wikipedia.org/wiki/Formal_Public_Identifier) or [namespaces](https://www.w3.org/TR/xml-names11/) when repeatedly parsing and serializing maliciously crafted documents.

This may lead to unexpected syntactic changes during XML processing in some downstream applications.

### Patches

Update to 0.5.0 (once it is released)

### Workarounds

Downstream applications can validate the input and reject the maliciously crafted documents.

### References

Similar to this one reported on the Go standard library:

- https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/

### For more information

If you have any questions or comments about this advisory:

* Open an issue in [`xmldom/xmldom`](https://github.com/xmldom/xmldom) * Email us: send an email to **all** addresses that are shown by `npm owner ls xmldom`

gsd-2021-21366

UBUNTU-CVE-2021-21366

Affected: Ubuntu:20.04:LTS: node-xmldom